Transform your 1967–1970 Mustang with QA1’s complete 9” rear housing and 4-link suspension system. Engineered as a true performance upgrade, this setup replaces the factory leaf springs with a fully adjustable triangulated 4-link and double adjustable coilovers, giving you complete control over stance, handling, and ride quality.
BUILT FOR HANDLING AND STRENGTH
This system is designed to eliminate axle wrap, wheel hop, and the unpredictability of leaf-spring setups. QA1’s triangulated 4-link geometry maintains proper pinion angle and suspension alignment throughout the full range of motion, keeping your Mustang planted and stable through every corner and launch.
DOUBLE ADJUSTABLE COILOVERS
QA1’s double adjustable shocks give you independent control of rebound and compression. With 18 clicks per knob, you can fine-tune your setup for the street, autocross, or drag strip. Adjust ride quality and performance with confidence - no compromises required.
READY FOR BIG POWER
Each kit includes QA1’s fabricated 9” rear housing, built for strength and long-term reliability. Featuring heavy-duty 3” OD ¼” wall axle tubes, 31-spline alloy axles, and formed trailing arm brackets, this housing supports up to 800 HP while maintaining precise suspension geometry.
RIDE HEIGHT FLEXIBILITY
Adjust your ride height from factory stock to 3 inches lower, giving you control over stance without sacrificing drivability or geometry.
FEATURES & BENEFITS
- Application-specific fit for 1967–1970 Ford Mustang
- Complete system: QA1 9” rear housing, triangulated 4-link, and coilovers
- Double adjustable shocks for independent rebound & compression control
- Adjustable ride height: factory to –3”
- Eliminates axle wrap and wheel hop
- Heavy-duty fabricated 9” housing rated to 800 HP
- 31-spline 1541H alloy axles rated to 650 HP
- Big Ford “New Style Torino” flanges (2.5” axle offset) for brake compatibility
- 5x4.5” bolt pattern fits popular aftermarket wheel options
- Drain, fill, vent ports, and integrated jack pad for simple service
- ½” x 3” wheel studs for strong wheel fitment
- Semi-gloss black powder coat finish
- Weld-in installation with self-fixturing brackets for accurate alignment
- Designed and manufactured in the USA
EASY INSTALLATION
QA1’s system uses self-fixturing weld-in brackets that ensure proper suspension geometry every time - no custom jigs or guesswork required. Once installed, the included 9” housing bolts directly to the QA1 4-link brackets, simplifying setup and ensuring consistent, professional results.
FITMENT NOTES
- Fits 1967–1970 Ford Mustangs
- Designed specifically for QA1 4-link systems with QA1 9” housing
- Requires 31-spline Ford 9” third member (sold separately)
- Factory wheel mounting surface: 59 3/8”
- Big Ford “New Style Torino” flanges (2.5” offset)
- 5x4.5” bolt pattern
- Weld-in installation required
Specifications
- Vehicle PositionRear
- Shock ValvingDouble Adjustable
- Springs IncludedYes
- Spring Rate150lb/in.
- Axle Shaft Splines31
- Width (Wheel mounting surfaces)59 3/8in
- Brake FlangeBig Ford "New Style Torino"
- Brake Offset2.5"
- Bolt Pattern5x4.5 in
